SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '106a1e84da7dc6e74c74710f0af69c9fd035e997b6128999a3b789301767b0ba' 
  AND token = 'wniGSqVNfuNygKxx02a47VJQSq371vYJmH2RyNtCzWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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