Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5bfb4f0c8115bb33e2fdc54ff0b6aa58d5a12aaf5953e6d405b8934b4073db' 
  AND token = '6+DJbDwbjJlE+E4lni592i2+eFubvsUJ7vgeRTi2gJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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