Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a312d477afcc392e378dc1c501480f3376122a90c2e9a723cb7112849aa775ff' 
  AND token = 'CSvVYeQWziX7GkKHAvXVOjcYhkMz0pb0XQpixqHB2zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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