Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74321a5954dddc219179713dab5ce8473e21a7f767cb703afc292fb240f1e3fc' 
  AND token = 'I069spXn02HFUWDK8Kv2mEa718DCfq4OfEB1QtPCVHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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