Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9d05cb583fd70bab51f46ad285115c591228a36dafae81363c6e27fa23c25a' 
  AND token = '5V8S1r3PqqkVDwWQHIorkgrpYkjtnVBbSdykopX7wdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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