Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4be3315122e083cf9d57620a76100ca637d172f5bb70fa3bbd840ebca560b68' 
  AND token = 'BOqWsgfkYSg1pNneu/2aeL2rBdPB/9EysjwefmW4+KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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