Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e99b4ba7a254706b4e6ec93a0f0f2b6be5af97b6ec8ada7bc7887298aa956b' 
  AND token = 'Hon7VWgN3txfBT5Yx4txpy40zO8q4sasLpkmwYPKL7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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