Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21d92f577467fe0fbea8a75115a279e6c71af1a4d639dc790f6eb82b2e38320d' 
  AND token = 'uH6ST34HFF+6QXUMHRozOF4RgUImrc4kW511CuVVu1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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