SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9e98aab1b927e8b5c496c51d0744681a6d8b3347c39150f9493d971c037d0981' 
  AND token = 'IV63/BYFqoxmmErG6uQCBKGcXAiGYF0TtMJ7rfLMN88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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