Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f6690db942c42da31101bb3f2fcca61cb6ffb53ea5b39de65b69bebf7f8bdda' 
  AND token = 'qDXQQp3m4AGE9XPwNPrToPWmiQB3igc0MbmLB7KVjp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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