Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97535bff938e9ef5ed7049c9ab9dd88440febb276fc18ebc9fa23f86a1a7e1df' 
  AND token = 'p4j3wSJxRds/LUCiZSez9aEdjWhq+tYlEim7n9vRoCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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