Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eee77bce796df55dd4b4e6a51dcf90a4ee505ef3f55dd459e2bfd66e5bf28b9' 
  AND token = '1gAW7IXw0N6NnvDrQUqEJUUQqh9f4Ymq2BAhKZToIJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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