Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d8f36d73e5c51f2cb187ce0104bce0f1513cc9379da37173df2c0e3e7b2aed' 
  AND token = 'UaNQZm7cDenoJwlIqCofZyoBiG/uVwbWnO6KOMu5Tps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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