Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905289df00cc3ee2aa4891496ff920659dd6dceefaf9129f6e3212bd9bb0a42c' 
  AND token = 'N79zdv58JXvJ3FpyKCfmWWTO0rWT0KUQNxhoUjONfuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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