Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21815c3558bb6e4d5f7a9aee63d8e0841088efa0610844635e70e3c61b3208d9' 
  AND token = 'pmuY9NmL/ajnzH6NDgvXAyaFnhCEsZ11WSL8NYJoN5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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