Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b343286c268d28ed3f570a17bff0e8d61fdd36d19440455d209a6c5eaf2450b' 
  AND token = '1fg1dqIxjeRwyKZ+59OE0vTxoTZuiPTBrldrqLJdZ1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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