Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a321626f23b9ab29827c001990432ce1ebd6fd789e79092af25736ba0c0696f9' 
  AND token = 'mYRUHYLtugvN+4ix1/XH83Xgp1VdmQ/KNFR1UUbxxKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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