While Expert Flyer is a good resource, it is no longer necessary to look up MCT's as they are baked into the booking software. Put simply, one cannot book below MCT because the system will not permit it and thus you cannot do it online, a TA cannot do it and a phone agent may not do it either.
You are, of course, free to purchase a transfer at below what would be MCT on a connection. But, you should understand that MCT represents a carrier's willingness to accept the risk of a misconnect and, in this instance, the carrier will not accept the risk. If a carrier, handling thousands of passengers per day will not do so, it is generally a poor idea for an individual to do so. Traveling on separate tickets, I generally recommend an overnight unless the onward ticket is dirt cheap.