Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8fe2332c32bda5dd2ddb9db34af0a3a3b9bc4694951f675a82f7360e5d5adcf' 
  AND token = 'x+gh4IQUb7FyyCmiCrzkdpCtj8BO8QRr9SXnz2qZ7AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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