Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c15467443634d88820aac1ee3a7d446344b829e41d36f0140120c52733817e7' 
  AND token = '9GbnM7GdoYlgJxB4T4+atap3vIfXJNlP3zPWpQgSu0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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