Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9f34319edcfed09bc8a422dce4f8c35bfc69290072e93a5563afc74c9d3ab89' 
  AND token = 'Z4VMS3m+ZbopyPxmcn7rnTG0RW9JKJziAr/AUdsZIsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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