Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795e6b8d44c541a7e47b5e06ee7f06a94df9335e31d90ad0b85f624026c61314' 
  AND token = '6FKfH/COFZeBOayk9aAsoDs6eUpvlyU9vkd6foITPxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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