SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5ce65bfa87a1014a2ebee0116c2cb42580a0afedc3abb928446bf98c57f810bc' 
  AND token = 'fCYrvjnSq3K4J2nUMz/JI77vgt/92GtXKv9M3iAlhuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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