Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a18d2134a45edb54501366951237912ed7c82df93c890921578bedab7ea14fe5' 
  AND token = 'Pd1KGVmFfxQpZyStgeDdvWvDvGVugOAszt361IXTDdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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