Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3bf868ea947c4a9d00bfef3174b289800759f4ea6af984485b2a30e72cac858' 
  AND token = 'AmdJQ8BXVdAQ0GvwZut997guz6kvEunuIv7UK9rjwss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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