as you have a dedicated security line for biz class travellers, and also dedicated check-in area (make sure you go to that one, and not the regular one) --- you can arrive even 1.5 hours before the flight. the security/checkin will take 10 minutes or so. then you only have to do the xray and passport control (if holding a foreign passport there could be a line).
but if you do not know the TLV airport, or want to have time in the duty free shops / King david lounge, you can come earlier.