Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ad6e3544d2b6efb61bc95c4f0ed342f6862b4fbd0ec2ed1f8c50f1706531b83' 
  AND token = 'x4h/NhZmU9mcKXbehFXsQbhIqg5L2jxO9eQfFanteJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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