Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7e1c9682c1eb027d8d8a43afe5351bd96260616999d913297454c6f1876caa' 
  AND token = 'ZVLit2Ep28GYXDbHFmcFnA0pmuI+raZ+OqoG9dTvCvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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