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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c19cd21e8b0875dece87e3e7405ec6b47a046d19fe4a4c30b391fa8e665e10c2' 
  AND token = 'xKk3x37uIl1CetYYqp+jgr7k0HzsuBtn5Izy0LyqAqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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