0,5/1$ KQo

Why do you thinkKQ with just a bd and 2 Overcards is strong enough to checkraise vs MP3-Raise? Your intution was right and fold is the only reasonable option against such a loose range. convince yourself!

Board: J♥8♠4♣
       Equity     Win     Tie
MP2    26.47%  23.97%   2.50% { KQs, KQo }
MP3    73.53%  71.04%   2.50% { 55+, A5s+, K9s+, Q9s+, J9s+, T9s, A9o+, KJo+, QJo }

Your Equity is quite poor. Really no reason to attack at some point. If you wanna continue, then rather play c/c and look what the turn brings but your showdownvalue combined with your outs don't achieve enough eQ to proceed. So your decision to c/f the flop right away is correct! You could say you have bluffouts like 7x 9 Tx. That kind of right but these cards do give another Equity to hands like KT AQ AK and if a blank comes, no Ax will fold. Given he peels again on 9x or Tx on the Turn, you have to barrel again on a blank River. It's gonna be expensive with poor Equity so tight is right and don't get to deep in these pots with hands as weak as KQ.