Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '335fb34c7926621dd8796c6b0ab3e0a24df3f41d65644c7b37b75865d87f2e47' 
  AND token = 'STbXPnwm+PmE0NfuaraUZRfTxcZSg7n574H9YHmMXus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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