Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd8cee8e23f3b56ef9864a7ee0add6aebfa97b90e663d11fbc128a664fa02c5' 
  AND token = 'mruZXfZlA/SJfgdu+s6HpnvY1PXzer3EYeQzRmSmIzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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