worth a c-bet ?

[werero]

Both players are kind of fishy and likes to make loose flop piles. I'm not having good equity here but is it worth to take a stab or should i just give up?

Limit: $2/$4
5 players
Converter

Pre-flop: (5 players) Hero is Button with K [img]/images/graemlins/heart.gif[/img] 7 [img]/images/graemlins/heart.gif[/img]
UTG, folds, CO (poster) checks, Hero raises, SB folds, BB calls, CO calls.

Flop: Q [img]/images/graemlins/club.gif[/img] A [img]/images/graemlins/club.gif[/img] 6 [img]/images/graemlins/spade.gif[/img] (6.5SB, 3 players)
BB checks, CO checks, Hero ?