Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d5f0ab2cf3909803a6e8223d77c9e126eaf2f123e55570daf8789358d2c6db5' 
  AND token = 'XsIsK4IyON+AlLYYabZzEZ5KhGeDvN6V4cX07iKpvnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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