How should look the mapping file for this tables?

users_main{
user_id //assigned, Integer
user_name //String
user_email //string
}

tokens_data{
token_id //assigned, Integer
secret_a //Srtring
secret_b //String
}

token_user_mapping {
token_id //FK, integer
user_id //FK, integer
}

A have this relations between tables:
user_main AND token_user_maping ---> 1 to N
token_user_mapping AND tokens_data --> 1 to 1

10x in advance!