Tools to find miRNA ID
If you have a sequence, run a nucleotide BLAST search at NCBI, specifying Triticum aestivum (taxid:4565) as the organism.
The miRBase page for Triticum aestivum has details of wheat microRNAs, and a page where you can do a sequence search with either BLAST or SSEARCH (as @WYSIWYG kindly pointed out).
Perhaps the Triticum aestivum page at PlantGDB may help.