Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd3c6dd56c7f701c9c2d7c9dd7528aeed5607fa471b9437914e4f08c09a72de6' 
  AND token = 'GvU574n2iJgNGr2iEdSsdw3vXbs2V9I+5njc7wj6miY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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