Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50da8b72674f14284904bcb4bbbb16a418fc37f69c79a19232403496bd46f16f' 
  AND token = 'jXJKgIEVqaQcjJUJNQR3SWnfSaV82GBaPMly2D4RYM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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