Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2c6552a4b7278262a294417ac14e0ccf92e09c3c03072b29df3bc6afdb9cd04' 
  AND token = 'K6oc1EBG91pmeFMKmkkN5RyqbQkB/EjKjMdEDw6zEcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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