Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a685c3fc14315866f9ae989da37e21275ce997b437095554ec2bb701fbe49b66' 
  AND token = 'C8Zv69nZUb5J372us2YNjA36htLKOBl1e03mpmUMRIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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