Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64d38799c711531bf6dc8021e409d2804311fa355bc8db574ba34caacd743114' 
  AND token = 'k6fnuMts9vxeNYPx52J3M8lTOpY731FEn23SIhjZA9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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