Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8dc0555366c9372efd51c3524a6d11d6fff6e9b8c746cb0735013df030539ae' 
  AND token = '2mzy+cIcYUG6z1bHpOMoMErDDNBnXD4vNcWsSx+epwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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