Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b4e004f288cc43bd5dd9d1e573fd2faa3bb21b6b1d60d2f3995c9ec0816800' 
  AND token = 'pHIJCem5KPm5e0ag5TmqjEBV2kXJD6JkO5bVxllMf4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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