Database
[{"_id":ObjectId("5b306824a1eab22e77858c88"),"data":{"Key":[["1529587723","KeyIn"],["1529587723","Num"],["1529667745","KeyIn"]]},"devicecode":"MP1D1XAH@LENOVO"}]
Query
db.collection.find({"data.Key":{"$elemMatch":{"$elemMatch":{"$in":["KeyIn"]}}}})