Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0210b5f2405d91e1196e4624d60eeec893cb1b9ff1d8cd5b8001098095d4ba' 
  AND token = 'evcImfg9W6LXmVmMWDHwee3RI+lEM9u9K+QWZA432eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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