Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a937f3d422158131e38c29afec99e27eaa9705516575af886933c554087539ce' 
  AND token = 'JbVFBnUcaqqkN5W+2XRzMxcIt+9jqQD5frY+rhsb7Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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