Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c74fb61d5d245038380486cfb87c1678d27d6f45d53755004b07d38d3f8fa5f6' 
  AND token = '18vV7Pv75Avtb9QkodQqu1oTXs0hPUoBxwdPk3uK2KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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