Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8251a27fd6a52a9d5a9fffb4f5c2fc19addd409d93b48948b6f15c406e40c833' 
  AND token = 'sSaMcOg/zsfl9Bfl32kUfbxy/0Pq71yz3t561YYy14Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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