Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f366ea31129c471cdb609abe03af9db8cfde1413a3f39f4f72a1c10f948d4f5c' 
  AND token = '6nUM6ZW1LDSlOz3eAXkZU0nFPwqsEjMd1ALJnz7DjAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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