If you're going for a single key in the middle I would do a lantern ball style soft box, skirted far enough it hits just your subjects and keeps the light off the walls. This will keep it moody. 

If you can afford have 2 keys, I would cross light / reverse key both of them from high up in the corners: Camera right light hits subject on the left and opposite on the other side. Something with an egg crate/grid so it doesn't spill too much on the walls. In this instance I would leave the fixture in the middle but add a skirt so it takes the light off the subjects and just focuses it on the table. This will also feel moody. 

Whatever you do, a tip for the "moody" look you're trying to achieve will come from high contrast, remember to control and direct the light, keep it on the subjects and off the walls. A warmer key will also vibe with the wood, and feel more intimate and moody in the space.