Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5590e1a2d3825799ca0e9ea29882ecbb3246ae0d2e4c2efcd55c453afac7ffac' 
  AND token = '4QvZTGWiBmfSvZIEx+BaMJf4UfQ4CIp06df2TmY1KDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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