No token inside the swf.
Works per session, you need a different playpath everytime you want to dump.
Code:
rtmpdump -r rtmp://stream1.seetvon.us/live -y "71c1y8lz0859tqdcvqbu?key=nofkkAa7xmPyYJNGEGGzUJbWCS2CP5" -W http://seetvon.us/mediaplayer/1. --live --debug -p http://seetvon.us