Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e8c4fb0f777a48c42d5756db41f6ba105c3c5b8a2ab25cc5a53f47c75aac517' 
  AND token = 'o16eh7ny3yHiGIbEqX3X/95JXIN2Nl6dT81m2On8Gq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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