Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '784cb6c8a846a84709a5ed8dfd93fc480c1be2aaf259d4a35bf7567fea443ca3' 
  AND token = 'WNOPTucsJ7Bn98cncK/nTm/GsIN7gGuLIlhFLxduZj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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