Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd635fe9c8e950abc9a24e853ba88f89682d513f07cd32c64480319f7c727cde4' 
  AND token = 'FDGMd74rcycT+IXq9oxvY4zT20wm0rncjqbZOmeUwpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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