Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '298e8268b0b7e911ffbcf0259b389bab2690580bbed1a6b3051b11f43d008c68' 
  AND token = 'sr92LdJSlOfQi93yBDsjYbLUzJzNn/JmO7QKv61JGnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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