Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a8349e47fc92fbbcb90f00721fda8901a5d2a1240d4eabb51ff2467e57eed8' 
  AND token = 'NvV9bdgq0c+bPxzbQ1NEoUQQVny5BdJzeDw8yi1fyWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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