Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9033ac4abe22806f9324c4b6e377ec7264af7ef35cb30c7aa34fc737ae89a84' 
  AND token = 'otZjpu6ADXJRhGLDHaJwVJNgRogY1oKoDgUg2kWlsHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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