SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0fbb385e93db24d11cf7a2f84bb8fe19eb0d2dfbc29fbaec465f7f942063e7f5' 
  AND token = 'njijk4siG/VKzTb0nhsL8Pc50EUCXmf6OT7OtvzQ8Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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