Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c54fd3f4ac204ac58320d95c51aa3065dcec6848703c4cdc82d9ff4829460a' 
  AND token = 'VaB+KdEsUYwCWFxq1j9lyT1plR/SI1MF6j++EaHspVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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