Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77d1afff3f9d5539b4cf690351ced03cf063ac8d0faea891df267972aae5041b' 
  AND token = '/oterKrfWT98Am/pLMCtpPHZLcu7OOpwVPgfHZMxQ/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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