Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6df853c4aeccc112e50f6dfee34c44ed2fe9da999b72c91255f97bff5bab4baf' 
  AND token = 'rvAHP3dkVBiUD3vpwW+W+K1kBMvKfGXid836glU7gco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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