Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe84b02b7c3b6a54d79846d91786d8263f251e60a8f91901630bbf4639b0f849' 
  AND token = 'rbuOfGYU401OnKWBtITXdl6Kh0JrLkqkVJWO/4Xy7Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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