Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1dfd792b94dfb3137138a991653491bab837e582a053739adcc8e405470ca9' 
  AND token = '6bWgKGFd+zYgvRJqzgSs1bbo39W5qAKmGQIU5OetIMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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