Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363d0c93986c98d73b71948f380141566b6dda7ad40405d773b01c881d02922a' 
  AND token = '3k+eKsz/p5OMY9Wy64vobCtJkDI43pBjIDe0Kyamuw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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