Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f919e45b6402cede1f35480412d12ce7610e118053c886b39ad4dafa455de5' 
  AND token = 'E14pKdbcw7J3Jd+bdf3RUWUfOL3vJOY6IOrDx7izJqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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