Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b7f5dc0c68c1b50da49005ea71276f20b4f76c93d9ac9c28c9cd5c592020a35' 
  AND token = 'rRAGzmkHCb1V+GieCsksLSvHmazEwrn/qfOCqEnLZ+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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