Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51532b23cb3ae937e6db20becb4e4d156cbee825fea2ca7e1cb3bb2d88cddb82' 
  AND token = 'oGV4AQKvsflBLOxHCWb4sxnrI12Rktvn3oCI0AQjoFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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