Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f6bed13a9e5e8e40bb132425f176b05123389241867c33662e04a8919d0acaa' 
  AND token = 'DK81fwbi8ecIDAUoahBwRBI/qbLE9SnA3kxSa/Y+8MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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