Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf348644284979583b2905cdde85b6d928e7090860023a49cf207706ea8e9f74' 
  AND token = 'lmn4YZTMX1szQPU5eV2qUreAN2caSHW6bYukarJ2xY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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