Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6f5288e8fa42884aa6f17932993dfc4832da6ddb0a0aa77e4eb0945fcb305010' 
  AND token = '4DHKj3ZPVeP89lwMupv/fGb6gdwNeb1eEka48VQ6TUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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