Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d252d2cc9b7581d84689b2d69f103a00b0993e1c23808a0c7871a275e9be5e8' 
  AND token = '5cwdEhi+4kncOsn+TzscYDmiud33SRqrTH0ZIHqLSj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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