Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8d2da6332fd4a39d3ce3885f8bad33c658f5a30abbf05c11d9df3827ad3ea3' 
  AND token = 'Q/d6V3l8k37ACqrGuCrcYHHrhMMRVM6+zfAImAsSz5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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