The Desertserges RC parish baptismal records start in June 1817 https://registers.nli.ie/parishes/0049 The free site www.irishgenealogy.ie has a record for an Ellen Leary baptized April 13 1818, Jer Leary baptized November 14 1819 and a Denis Leary baptized October 26 1824.
I did not locate a record for Mary but if she was born in 1815, records are not available for Desertserges. I also did not find the marriage record.
The 1829 Tithe listing for the parish shows four Daniel Leary records. One in Maulnarouga, another in Tullymurrihy, another in Garranes and a fourth in Kilmaloguewhich could be Kilbeloge in the current townland list. Not sure which Daniel is yours.