Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7bb8b6c939f8ee4cadaa5d4843b5adb1611b757afe8dbda3a551af3829cbe42' 
  AND token = 'LxYY2nr723ZdtaPxjsxxYLXRhzxDU1b1xuLWPtLUR+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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