Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '727b8c04c849b8cc359e92eb94ae4388d93954f866d4888f8ad99268896019ec' 
  AND token = 'KZYd0AZEuo9OLvOr9o7HBOBR8pCWKSJykAQtItFRgCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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