Ghufayla prayers is one of the Mustahab prayers which is offered between Maghrib and Isha prayers having great rewards. This qunoot is to be recited in that prayer.
اَللَّهُمَّ إِنِّي اَسْالُكَ بِمَفَاتِحِ ٱلْغَْيِبِ
allahumma inni as'aluka bimafatihi alghaybi
ٱلَّتِي لاَ يَعْلَمُهَا إِلاَّ انْتَ
allati la ya`lamuha illa anta
اَنْ تُصَلِّيَ عَلَىٰ مُحَمَّد وَآلِهِ وَ انْ…
an tusalliya `ala muhammadin wa alihi…
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اَللَّهُمَّ انْتَ وَلِيُّ نِعْمَتِي
allahumma anta waliyyu ni`mati
وَٱلْقَادِرُ عَلَىٰ طَلِبَتِي
walqadiru `ala talibati
تَعْلَمُ حَاجَتِي
ta`lamu hajati
فَاسْالُكَ بِحَقِّ مُحَمَّد وَآلِهِ
fa-as'aluka bihaqqi muhammadin wa alihi
عَلَيْهِ وَعَلَيْهِمُ ٱلسَّلاَمُ
alayhi wa alayhimu alssalamu
لَمَّا قَضَيْتَهَا لِي
lamma qadhaytaha li
'Qunoot of Salat Ghufayla' is tagged in Qunoot Duas collection. See other dua's from Qunoot Duas