Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ee1f19f8dba0450d64d79559e7c41e6f74fbaa5e4955b2b425b0a30ac343a4' 
  AND token = 'oVwhqtKi8HWn7v1ScLQvfGUJqlHF4sc0MoaLdp5VuEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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