The 0.000055 BTC transaction contains info about your MaidSafeCoin transaction (also called SPT or Smart Property Token). I believe it exists just to get that info stamped onto bitcoin's blockchain.
It's safe to carry on spending your bitcoin as normal. Here's a quote from one of the mastercoin guys (MSC is mastercoin, not MaidSafeCoin by the way):
Your MSC and SPT balances stay with an address, and not with any particular BTC that also live on the address. You can safely move the two independently.