Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736a51d4bc4744da9dca97034adb54c080cd4efd7dfb6d1d7a78176fed35c55a' 
  AND token = 'S7gNkbEs6lUSxxoh7WNs2yDluefxtkwQWz8s/TWq50w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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