Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd91bc01e94fd98174f94244c5933ed70afa963ad444b8c998363cbe349e803ad' 
  AND token = 'FeBCLhcsbwI8zzox0XG8krTBUgMdl1EWxVDkmbKVLSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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