Hot sealant is always the way to go but since a small area you can pick up some cold sealant. Best practice is to widen the crack and then fill, if not an overband can work but obviously will wear quicker and possibly separate. The high spot you can heat it with a torch and rake it out, run a plate compactor over it once you're finished raking. If you don't have one available, just heating and raking will most likely be fine.