Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af6f3abb955613f6c533ed256718885b98e7e5dde6c6a8cba00a10f0094ad302' 
  AND token = 'D1fl75N5ekN8iykNx8nD5jsiLXFwEDwSGmYo3dba+ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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