Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ca8941a651aab0e0d16d7ad7f40186cec6294b921a36cdde338d60d5bd6d94' 
  AND token = '5+pssClIlNVm01ZJIbcawVeGLIpAVlOdqcfKTHyPp/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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