Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c4fe477c96c46e072b4ecb8565944f5ce3f7ced2ae177159c26ef6e9335ac9' 
  AND token = 'SCRV/Q6+QrXfna/nkGQ6tZat71OzhyoWEnRAZ/iRXpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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