Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c9e8a16fa8949e29ebb8f7bdfd04d405cff6c0315d77ef917daa82616c04ba2' 
  AND token = 'VYYrWUR+WOsAYLfrJkXnhNM2Lyj0rF/yqRS7V1Tm+zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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