Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c38b581a4f1d667abf8ec5bb7f4cf15ad3e7b8c604902e3b8fa193a0e39d312' 
  AND token = 'm3qhOGjKgp31bdU40NcDXymI2/GNYn3gByiB3sGscAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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