SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ab62fa922359d4c57ccc1677603e639aef39846e8827b695dfb990142ee10606' 
  AND token = '7+ZXaJPbYnQeOEvzl6IuyUfBiQfJchJ4cjnUqqCnQ58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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