SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5413e0111ab34fed9e19a81360b150e99b29bbf597c4bd686e8a4c746757d6e0' 
  AND token = 'CD7A5pfx3AxMMw8lYwnJwN2SgkfvutH46vVwLWzmWRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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