Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c06509f833d46073f423b1ca265b82d94ff8cddd5726ed926758fee7a4d52e4' 
  AND token = '89j92x5JH5ncXbR8Re9rK8wtDy5rIT4dd+Y682gjmLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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