Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1bea493e79387224c76c1517c5d2ac2a1208779e6e01182d3f838d3a99d5c84' 
  AND token = 'ekRuMMiNk0IDGZRJ5QfAYbZzhKXYuNAyA4AO1yZ1Ouc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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