Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6cba048da383326852e9c7177515705c8c949eb8b7494bbcee7d00234448443' 
  AND token = 'IFTQglhjDIMoWwphP9ROnkvT0nw4+x6cqXFhqo3WRQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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