Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42432416c693121035420777eaeff1a8a3778668a0f42ad4025b63fa3f05d7cc' 
  AND token = '4S562Lw6EHtfJViR1mU87lldhJnt8jP/eBttcR1+P00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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