Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88d990fa0392c8be1ea2760dbcb89342238180892a244ec9a39566a4bd04a4e8' 
  AND token = 'NvawEz7wzxc5jKeipQHjZfSXfqoc3dZ4wMjlxRCa5go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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