Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7764cdcbcd4bb9c18387bc58a97e9e9cc1efcaceeea2218bbab57c16ecb8fcbc' 
  AND token = '8QSe2oB+7McwHM4FHgW8xmg/kCm81POuvRB5Ntz75GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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