Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7487bbda1299ff207947a2adc2e7fc8e81d9a2d7699e81f6d8ec0bed040bb76' 
  AND token = 'on9SGKU0LBNc75ZNsK3Q+5Y3BVB3v8jLYRi+piVV1lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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