Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68672627d9f8a92ec5586f8291ee8a2eae890959a67f5f4f460a14dfdd9b575c' 
  AND token = 'O/4nlfHlbcno5mmq4UmeKz2p3dNcqeE+R0/GjNYzZ60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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