Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a820525eb5090745984352e1661a02c023bc3e2f48bc124eee374922b4d93811' 
  AND token = 'orSeC3ZsJH+YKgUv27PG0VFv27GtDIDdIwPYR88Uyk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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