Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7ceb190ebe274d42973481df6bd178121175526ca89a74f0ed545e003777db' 
  AND token = 'hdeFrP7WTQS8f/RTD56seSRulJeQE5hCKavuePnzUzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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