Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4685da973fa72c85a0971529e0a79f046e085fc44b55e1326c4fc954ed45b135' 
  AND token = 'D1oATz/YHtDiZ8WKwrExhor4CAaAqUKb7CTdHjXKxYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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