{
    "_id" : ObjectId("5cc07ea943eeba155840b62f"),
    "name" : "test3",
    "value" : 3,
    "created_at" : {
        "$date" : 1556119209477
    },
    "updatedAt" : {
        "$date" : 1556119209477
    },
    "__v" : 0
}

Item.find({"created_at":{$lt:new Date(Date.now() - keys.anAmountOfMilliseconds)}}, (err, foundItems) => {