Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2978d5c8068304551d66fed8b7a8132dd693a450406e043b8be189e0a36fc24b' 
  AND token = 'g8tU9J+cUa9wvItOmhtJdMhfC/gBfzl4OntSwa9ir6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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