SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5f1e6f442ce1bc3a635082da63a4906eee8ac36bed35e86217e37a201a7212a2' 
  AND token = 'wjCLzXoFmrH0BJhgzutZPVCG5mBuZje2cieYDkS6EUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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