Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '521306f80687c287a581f4375f2279e047bf6620c73c621c96dbc0993467ce69' 
  AND token = 'SC0xJoPPNMRcr2vYxPamjk4YDQrmxHCoKzwfgODJX6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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