Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69755deda12678ef2e5087ceb1469b7ee86ffb3c72f09daade109d86f08fbdb9' 
  AND token = '40WkY2L9KeK4G6tSbaR2JRssi39cx8Jm1An63oDszSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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