Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9cd96e2003b8a9606dea59452728239ca7fb4b4717617ffc7ced609314b9467' 
  AND token = 'P5zU1GcPpwlt/O7UiiyV2jbezwHbWPiMpNjfaV6NrA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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