Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd65dc87701221cf165dc2b8d08cc6da94c446ad7dacd9eeb8aef8eeb6ec65bf8' 
  AND token = 'xg15dfNtDoAHRAi/Y1E98BerPAkowqj1jpvwPDPjoeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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