Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2db20363e98ef3f3ee58775fd60fba00a982fc986049f9f456ea233cf335c6e' 
  AND token = '6GHz3FFVS9Ekq7/4KpXiB6Ws++lvPaQ3yvU4M8az/tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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