Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9f1d29d412a6bf1d7afce3b28e3edf6813052c17759ebdccd14642d2b0f5f3' 
  AND token = '30vFKLCAbuJe807+ZsQnRuyaZG7vEiLIIrYAaG9sfNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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