Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598152969ee20cf8f647e0bbf958a3e9cff3cd9ad6cda680f0e0d6ea0741ad17' 
  AND token = 'Oo/6s0oa2SN7Xq4ySyb0PvGkzjLv+M3X/iQPCL6Vzz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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