Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '338a6bdda5618321c64ae61319cc3961602988bf0b0ad3390bf01fc2b2705383' 
  AND token = 'DB0yx3j0EuY58cjm3YmWzk2LicyI23WPariTSx1a9F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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