Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5881332b0ee04a4f3fcaa0fa8f8419d338ffd959958fe701d2b851f4bced8e32' 
  AND token = 'F2PjtcHtZ4I30kOjA55fjHfIgYGo5f16oXmOskAe5Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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