Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4ecc798d506aa871c78009db6ab06f806ca3daa72f4e813d7bc586ea1c073e6a' 
  AND token = 'ir0rbM3TvF4ccMte1nC0FrzVKkhNnESMOWjG3w7Mq+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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