SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3dcc068c1d18cc6f04335ee33d5839d6e1e0c0bf726120637a680774c2f6426a' 
  AND token = 'es+KsOVTAuZJv0Z5I1nBFv95RIqVtMxIlJKlFCLrGuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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