Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6e9cfc7150556ffb4ef30da1dc74c8378f8125c0f0ed0fc4259b6a2d6ffae1' 
  AND token = '2vtiD0jvHxykLT/DEbIQ93QrBIwet+eSOEBkSh+/2fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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