Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b778153b6e62d1a70490a8419008cc01913a6ddc83f3692a508c201b58b14ee' 
  AND token = 'TyfgxBQS1OdusysQR03o5O2yHpbHN3gYYQUjNZnIndA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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