Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0ae3fc67592718a11a460294e1ecffb464732d5a0f2460989b2dff2b55bbf5' 
  AND token = 'GG7c6xG+7p/4ff4nhNhgqtdROqyIGqjHobDkyJf7/1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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