Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3544429eb670effa47578ad9359aa12fd270bb7de652aeb5aa09324ff07b4a3' 
  AND token = 'DiNBW/4y7G8pmyGcJ8QQyT0NHoG7TEiy/+Vs+HAJiYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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