SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e127653298c3fc6362240b956a66bbcd37a7a27df0c9b23180d4526290d9860d' 
  AND token = 'Ysgqer6aHfVJZ46Ntj+Aq+WVO1wVUqoHbsg7+viXhAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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