Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f73908726afb6a93252c03c6cb12d8b5aee4e56a7ada34c96a689c369eaa6e' 
  AND token = 'kdZF79pPIApp8HFLXxQKU+YmejYzfFwEvUcMVVM7mhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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