Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3563f0c19a2936b018a159070a2c5e916ac5f3d54877cf6229c7da5644ff5f5' 
  AND token = 'QeTzpQLf7V+eznQOgS2WzStWzqS3q4XNV8LZZvXZYWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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