Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81ea51ed2664a3b3980a5c2a2e9b071e9ffe5e1f711a31bc327cbc2699bb8156' 
  AND token = 'amDj2Fk4Vzoef8sJT9Hn8QjpgJpo/NE5nwRwodaAmX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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