MySQL explain qury: using temporary table vs more rows examined

Can you tell me which explain plan is better?!

First:

+----+-------------+-------+-------+---------------+------+---------+------+--------+--------------------------+                                                                                                                             
| id | select_type | table | type  | possible_keys | key  | key_len | ref  | rows   | Extra                    |                                                                                                                             
+----+-------------+-------+-------+---------------+------+---------+------+--------+--------------------------+                                                                                                                             
|  1 | SIMPLE      | a     | range | uni           | uni  | 11      | NULL | 122431 | Using where; Using index |                                                                                                                             
+----+-------------+-------+-------+---------------+------+---------+------+--------+--------------------------+                                                                                                                             
1 row in set (0.00 sec) 

Second:

+----+-------------+-------+-------+--------------------------------------------+------------------+---------+------+-------+----------------------------------------------+                                                                 
| id | select_type | table | type  | possible_keys                              | key              | key_len | ref  | rows  | Extra                                        |                                                                 
+----+-------------+-------+-------+--------------------------------------------+------------------+---------+------+-------+----------------------------------------------+                                                                 
|  1 | SIMPLE      | a     | range | uni,cid_tgid_mediaid,cid_tgid_clickmediaid | cid_tgid_mediaid | 8       | NULL | 15197 | Using where; Using temporary; Using filesort |                                                                 
+----+-------------+-------+-------+--------------------------------------------+------------------+---------+------+-------+----------------------------------------------+                                                                 
1 row in set (0.00 sec)  

For the first query I forced mysql to use unique index but I got 122431 examined. In the second explain query mysql used a index and it created a temporary table but there is less rows examined.

Can you help me?