SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dcc5b9fe7c5a9ba8f9190819758a56a3665a04f04693bc5b412e75c8327082fa' 
  AND token = 'gv+0bqZx8CRPvZlV5GLQG5o+vZXXjP7rQeQ8UR7Rq4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}