Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d364c2d91b9c50eaa530f2ee1f4cf1ccd900e167ea692f4a5cbfa2794a96fc' 
  AND token = '5rEroLdDvBQsW8NRfyE69uNL6JIjLtrTyVsEiSgm/a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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