Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f6eaedde70cb5ba3f3736f4a85716d2c8e905e34b7fee44575bf2c07355ac5d' 
  AND token = 'sexr8w7z0N5PgFpV9oqY/JmEaklSeAk+RCRkxZD+23A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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