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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0028a424d79bfe6d16e13251e80635a4381365d931fe53c82c0ea5e6ad98fb1f' 
  AND token = 'QuAeQQx1szf4MvOFxrO0OHyWIL3BvH3HRniX++1NacY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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