Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b285d83e5fda2f0b2e8203d653d4f7ee4cbaca6d7fd1519bebe33f1d3d63b2' 
  AND token = 'nxI4bBo51GGyq1D8sszdWt0bWKh6iYmiN2Qe3sX+ud0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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