Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca5aa39d1d63a6e1ad35172ad77a90b11cc7db8292664eee4a0c99fcfc0f914' 
  AND token = 'pocqP99pPlhV7yTs/Elthe2lSstk/+yB/UiHMIVtmE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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