Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e03ba4e977a4da6fa8075d5947f187c1d43f2c5dea65e55e4cf64788cd43b2e' 
  AND token = 'lM+XQe7U5/+HEsZKEDCgUQ6KG8P0D8GRRVwDx6mf7Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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