Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '721bce1793559f2e8c76aadca5bf7f2a71b5ea7fca1cfeda83f0b8c8f512361f' 
  AND token = 'YrIMGq4aTISu61atKUOhoqXB70bfOn9Mx34DOBkXclQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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