Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8754a899aff1fcfb25d3d4f062a5dfed5b9ff4c40c6ec66e1bdf8febbb49c5b6' 
  AND token = 'kY1b4ox8ByVqsL4RVvyYKtEr0m+BJ3xU5wWQOE9HCdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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