Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '821df10f323f9eadcacbce1ea4bc108af9035a46cd25db47cb5238343b581119' 
  AND token = 'Ew5cRmHoc4BHvWa3xoBWHn6HF3cxq+Kj0paUgSVHjQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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