SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dd41f39b76c88ef51b7397ad772e2c0356d96a82ac1e89b8f1aa26856cd9d229' 
  AND token = 'lo4KOwWWi0YH13L+JqonBCyfdqmgkrJQZS6/FJxCi64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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