SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8794b9851230d64e3c3feb3052484feba96ae21172b80876e52b213dcc06d012' 
  AND token = 'S9Ah+60p2TfTZHV5j4yNGUvojAr6FZIKeb0RURmSu+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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